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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb3effc83272d939b010f24da436423d1f53d91b9685be90e4f2a8f5669a836' 
  AND token = 'heN6l4/NEQB2fe7lElX3P4vJ82UpOdDnNi3r9AWH/80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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