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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ead67bc704d525a622fb3f8336c580d957a9310a9bbbb2075fa81abf2baf37ee' 
  AND token = 'wLORS3V+1kYyRoISTma5TPvPYOpC56I3mjhmUQlCnMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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