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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cad2ac02c0f8d6efdabe65c3b95b35a0408920ee37dd4bed3ddbc5070cb76101' 
  AND token = 'daxiMReV49ZgShfpdYwQG9ueU7q+7Y/1mq6WeZQKnmo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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