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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ec2426a328005501aae23f41fa9109bda179da28eee8ea0d00c30b4c4567ba6' 
  AND token = 'gyvV8Cmw5/h4yoaGQhnw27dIFovtq/4xj+IEuY66Bvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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