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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c96d47a170a1f2561a26d60025356c66ddf06ee13741f5c697ec0c133c8a1176' 
  AND token = 'igZPVl1vUAe49vgSyvR0QUymqZdMkBgx0eRU+lz3AZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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