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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '615f93b4af0e025e8aa61833926b3a5f61765628482cd1a69e4f5781d6d86195' 
  AND token = '/WuGi5lMuH50QbR13toPMHwtmw9VxL/zPiWMqlQXW64=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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