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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '29c064fb496f7ee0b9c3fe261a29c9109c7ea960a2c254631beb257b3af6f08c' 
  AND token = 'SRukzwwSHA/dX8gyT0X1EUN+1trq4+RBcOdI3kEm01A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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