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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a6030d55c1d0fce8959a5ef4a8b63cbec305659ad8ca2fc111561994066e41b' 
  AND token = '6MT/kvRRuFj5TCnq4A5H76hTel9z70GpGzQGINSv8+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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