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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '546a67a8391e60c40818fabf9e6b69af379cf4f3499525e10fe4ba3d8fe89f42' 
  AND token = 'tnFgjo74JwvYSioPpB1fW9DuMhV8ag39puAWqKWqgrw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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