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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c559dcd118b1b5619b7f50c6f6f100cb05a24c5ef04fbcd6914ed4b22576201c' 
  AND token = '9ExirJQ0gXZ+zdA5W8jlX2tIX9MqyzkYqnPT/etaYVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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