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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b88041970e95718c599979faac94b28608a28b0abe4cfaa1d47f23c73ea742b5' 
  AND token = '+WVupLkTN7qxgd4C7uEOxl9OJWbgRAlMEarV5joKppY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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