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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd3522cdad7cd777bb595dd3f869eebb4240909b7c5bfc6059694afb5f507dad7' 
  AND token = 'Dl31v5ZRka8e6XCprNUM4Lpq+H5V9rahTj3CqVQOvGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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