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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '464007e42d1f83c3fdec4ae792bdd639a3ac687083f2aaa539fa080b9ef09040' 
  AND token = 'JM4hQ94WyVWQv6+o27NxmF+3SPiBYw7BE2OwlrE0J5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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