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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e01b429d393bb2e30d9adf9d8c5fa6ee9ef710e2e2e8bae3cddd4988af42511d' 
  AND token = 'wAL/2w42tUqwqzDyGzIBRz1OB3T6gGsCBRPVA0CiAzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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