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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17ea3a93d0d4374b85ab006b9df586f4a3d723c5f71e6c028f3cbb587dbcf172' 
  AND token = 'JBb1lL7i6zzMEseKqocgZHfjLftlBaqdA1kX6678FSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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