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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1018c1744f2fce328c4d26a430bf6c01f66d8f73f0d386fdc03949fb1770daf4' 
  AND token = 'WLqqrExon4Q9wIAicPdEU96+CEa8RrjBds1ZC1MDzN4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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