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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60d93d531f664d0969cd71f8aa989ef8f0608cdb7384071133cf433542d34d46' 
  AND token = '2AOMDdYbCAa9Wk4Crs9QGfLHPH6mUGJJlQtVajJ0KKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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