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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2903e0bae655381c5210d0c87292ed9925842898d479cf6768d2f9f65edac2b' 
  AND token = 'T2QFLosfL3hhizj+Dzt+b7Pc9AbzV1X7KHT+APMlzUU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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