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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f1ac5607f363b8c6231e4dbdc570ebc8c3a0754bc7fc2cf11cfd3de02bc6d03' 
  AND token = 'EGlR4PqX+2rWNWoHne4foV0fW3hVud20CIj8ZLBH/Q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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