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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a9b5a038c2c29c7939a1d2c2780dec0d0e117ce6bfe6bff1720ec69680af4cdb' 
  AND token = 'Q4JtrPTiW5+S5XKEqCYKtcdRMKJnUgcHlBKfU/AEo/o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00102

JSON explain

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