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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fababb76e5453d213610b2d944ea9d8f6204290d05cb4ea6608990464052c4d1' 
  AND token = 'b5eNxOjCM7KguAraMMF+e42I+/WPQXwfPTxus4+Y9EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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