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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c71c18f3b5681ee63186aa62c40c5080ff5f86625e4c86d2a9b8f69875ff1bab' 
  AND token = '+/SNUAxGW1u6OkUwwiAXuUrz6gYX6tvWJ+/6oCe6tu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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