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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39f4c1a904910769d2cd99b6d9bcdda3d641536592833f5f89716a99b2462ef1' 
  AND token = 'lm07Gl2pYjcDOCXRvxN0pTLXromIcbWe0/QBnDB+xDg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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