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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23b75efb97905e6214af61a94a65e8c9b680837740188a7746e2fcd20592c49b' 
  AND token = '0koKk8VqT7v9XZ5RuztvIMevMm79TOteedTD7yAP9lQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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