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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8a60789f4c9f0511a0eeedb56e3648662119711b8f6ddf73c16c5dfb78b5cea' 
  AND token = 'IPpn5JctFhgKPGFWeZAugAS3B5c5aWHv6jvc0e1URlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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