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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9141e04d63214043e302b2505fc66ccd02b27669c2453c20b8c82a2f368e3150' 
  AND token = '/Buu63Jo2el03XC/yH/T5Mpqikc/kqT92slTY4+Md6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}