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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31a429dbf1368ef0e57cb536703bd16b0d41dcebbe46ce45aad8026c5a2a1787' 
  AND token = 'sVVzvs88vjNj6HNqS85g1eB2Dn9RvXVai2EHaK4yos8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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