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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e839b6e61088f28b0c015fd8c2d6595724229bb696c68719c545613cfbe2e615' 
  AND token = 'jz0W2XefYBLe4Is6VDtyOey5DQWcUXrWKxqYobXce+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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