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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83e0868ae720eec041783e20aba81624dbfc7ff85e875f94242f616ec6e823eb' 
  AND token = '4zs58JPOwBa2mfiZLHQiU4+xULUxLaJzg/wYx3EDwYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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