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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '701cd1f055ebc259ba45fe491e38742464fc4e6a5ecc60998ae5c0b196a05138' 
  AND token = 'dufGBWaIlTXlIJxfZJth07DRD7zzQTyTeGYq4lKwmx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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