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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7a2837375d402bde49cd7e3c4d58637034dc3a882afe3e511a6d36d863552fd' 
  AND token = '4f7hqUXA2kyNKjLeBD4MKcd1W+R3PpZBdYZ9tPu6baM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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