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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'afa3e7e3d30759c215cae3c3a7ce3fe321e0d45777d9d513874e0939f210310a' 
  AND token = 'exSdnlU+EGtfXBmey4K851JixiBNMpJlgZ6R9poBS+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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