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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f001e6e01b947c4d4e522fd5e3d6f68086d01c056f728c177d82eed019bf22' 
  AND token = 'dpbtguHcWaYAok0JjLThmoC02DdDGw72faGIhABe1+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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