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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62d6240fdc229caf7dcf98caf3cb411304c4d33255d61fabcce645a9add7430c' 
  AND token = 'hCkCiz7UjXKjHOs5DAY1vp3YrOyYf1Nqr6Zc+e45J90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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