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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24e1f40dc87cc5f52f8fa3f37aab9e0f31dd74de09c9055170efa5355494f8eb' 
  AND token = 'XDuX8yBROPf9WMru+Ec3kr7qHhVZEI7WR2URZgB4plY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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