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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0177e947ef5c624e283151e2a0d90baa8d65bda761a1c90b6678f58a25fb8f75' 
  AND token = 'e4h0ZfZjd+3ycWO9U12xtBgidGWlVQLjci/m9m49f8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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