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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97928ff3e39d6908957efdb1720d46161fd11f4827b59a0a1e56b52b7029837b' 
  AND token = 'KLtVxaierAL/5NV2cvnzSA/nrO/WCci2iJrV8kysb2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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