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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300811c71cfcd44cea1c6a029f546aaf1898733720ac24515cf3d37cdae9a215' 
  AND token = 'jA5jJ9Eme+7/haKxJRWFz1/QFXuv8nC5zGJUPf5acPE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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