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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3c68c39bee686166a36f63828c57892e58e90476ade37c104d5bd3ac143e1c1' 
  AND token = 'jKO/qktEtMUs3BMErh5NCq14cf2qy/x0GcckJhXax+M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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