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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e4f2e5ffb943c20d63bb2473e554ef8077ffc7d12e512f67b6f01ce76a5757d' 
  AND token = 'x53DcjwmoKxWT18XKPoXwhfpoIMdjENOSC+8z50nrdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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