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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8837bfa4303dc39bc8ec773fde3e8bf905922301311a5594b7fb8b836db634e' 
  AND token = '2V5lXJ/BDz3V2Ccg3r5CpUe9/7hEDo1PHR/JIuVNo40=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00125

JSON explain

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