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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ad2730e3e5b7afe9abe880fc8623ca1e64e453d3199e88d4613b4441c6f2d3d' 
  AND token = 'KMVi1QaV1o0fpnJDtlIu9FObQMDlrZBXh4SdGKE3XL4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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