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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '803a17ab566467bb4ec329276c7944f9c70b6ba2081e6b71b4432770d771636d' 
  AND token = 'vDh2P9EpFfQhXUEUWsIdQ/wjNXX/Hf9EU0a5v0mzpAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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