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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c34cc6d86779407d389bc263ab862c5c0312f4ecf033d74892b16e6516b269c' 
  AND token = 'lobkQrtEV4XwwsAX4+PGWBUCKTAvkK5oi3wC/Fy0oho=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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