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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '900b27425d201176f5d8d10af5f2cd0bdf12b2947a93ea22bc246b3bbb323a49' 
  AND token = 'LD37bR1WL+7VJEVoxeucUw0686CIQUe1n75S5ATBH7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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