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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0705c169e7e35c541de848714a9716b081d1c33d97f18d1c0c6fdf669a22c04' 
  AND token = '8HrY0CZgGAJ5ZhFsQ6KkoHLYb9w2EnyipXG1392Pb8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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