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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2bc12d13d87d5c0b9f92f9452a33d1d82c82ba5e33710ee6e0f9d1fb2a79593b' 
  AND token = '2LdEzKgLrpI3I6PpghHHc6KBMIb3lb8oBFC/Cbx1FFw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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