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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8772d0cacd79d5e6edfb3ff6137c029693eab51e40bed8421611c34f4d26146a' 
  AND token = 'QkOHg2j8WcixR49G8L0+Tw9MKixePuGj0N+ElBBbU1A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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