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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c6f5f4869f9e13dc0673bb54c5ee83ac8ba72a044297c46dfab00f05256f5fb' 
  AND token = 'pQdYWNyTTNAZX5XDsPThjdOyh+gcAdzPlGUT4tAs+Bc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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