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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2b20c26d91699b26904899e6c39e7ff7ec38c50db4ff9894ca25bdfa3aab9012' 
  AND token = '1Q1ARX5+6Tni8bntutIijaGNnGHlWYRYrUH3cv6W97M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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