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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92332bc34f390f084715402a8b2b8abee97cd90af07f53303076e7202f841ccf' 
  AND token = 'Urm0pscvKv7E3Ur9/uPwr9W8m/Vc2bfb6Q5MExfeGqc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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