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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a31a2ac4b697be8805a57b9dd881c36f436673e80432fc7213c77e05c03f5e4' 
  AND token = 'pgC4fblbfivGnwJbSzpCNoU47x54Snr+UgxP9n714Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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