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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04619e56bedee47f9658f4b04a724d5133829659df145be11f89e5fbd6fba7a' 
  AND token = 'RbfThpN4G038g9tGJnvYptLtFkvBnLJ02QI8EqgzX6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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