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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97a5aa31b66335dc97e36360a21b7c1bfbc79fe3ba0a5cfd92f67cbfc21badf4' 
  AND token = 'mkWuhIyATbDIH5KMVil5q973yEE1oDuKZWnXGYdZA+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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