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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e4ff27bba6d6e0ff0d3f7cb5dbc940a52628c2f96b5b003d7d4b984d996b45' 
  AND token = 'DLGlTtvDWsY/g9X0hQit6Ltu2Mndw6QcbntbQFNCjeg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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