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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '150f1ead7f7aa2fd37a024f67e47fd0676af825bc17b695a08a72ac6edcdf85c' 
  AND token = 'Pd9D/i2JVIFw3wzAbrIk9GzbD+Ji0M0JJT5Di61itrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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