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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd93ee4e0b82dc6729062f0a52fdc8ebfe4637a17b9a7ba7f44001fc711331b24' 
  AND token = 'YVDU5XIwFgoy4A9uCyvgKrwRSAHLKNMwv2FHHFmOde8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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