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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8bdd30cec0bdca359952ce3201426764365bf3250de02dc5238574f06fa82f5' 
  AND token = 'Gpn7sZTrJ0ejgIAj6J/sncxqUxq76zK/B3dTeQTya8s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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