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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dce081bc3abb864e72174931a0a7536810d62b1ee215a52b5e995d899bc0569' 
  AND token = 'PE5kosd9vMJ/TiVKxlKkdc46fF/T86wg19MmVd+cLq8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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