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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a31c5bbb403c3261876504d4b5d767e2e1242ccd04c9ba65cc214a1c07495ba' 
  AND token = 'FnkmaJrmvOlv7P95hvScl/CDdnHZiQdLASRAxpOBOZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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