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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8f0a954bf12e78eff7966c2beaeca34a8c9e0bf65afeca0f84a0a14e7967879c' 
  AND token = 'uPRS80tOw2wp8u/HD/et8cv2yIjokMF+p4YhdoqpIf0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01614

JSON explain

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