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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1d1e0ef6a9d4a7c956d7a2c0e1e8db690151bb0b2b092719bbbc2856172ebe' 
  AND token = 'NIetAg/ki5URpIczF6D/q1RImovoUPVsi71JKOKAkSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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