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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd66db1381083a14d4f6bc058f78f50b20d70fae34588ca27c50d4f76be0ed39' 
  AND token = 'RFWVLnpUR0U7tUJVRaC1y9iCaBW98UTGtPTODQZClN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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