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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca2c34f319de8f0beb5aed97c3e2e437d78ffd6211eba22840737ce08e1418f' 
  AND token = 'AqLUB8rhlY8HxX36FmJj1a6XHJmfcUy4ujO6gt6mSpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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