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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5274107311f58aa26df17a16827d7e52b9a07ce6f837729ae827ba42a3a3fcdd' 
  AND token = 'SXqtb96KGpgrzcyB6VwxdxoxKSFz/W/7Nsr0ZL8D2dI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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