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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da8633b0e0f7e5e2f5be78f35fbadc6c3e359f59f12bb4f35a9be9882aaa804e' 
  AND token = 'js1k9Seiru67ZTU17pOqI0uas1dJicc6xykFAjMmXR8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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